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AA-2008.0005                  AUSCERT Advisory

                             [Win][UNIX/Linux]
     Certificate validation vulnerability reported in Trolltech Qt 4.3
                              11 January 2008
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        AusCERT Advisory Summary
        ------------------------

Product:              Trolltech Qt 4.3.x
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Provide Misleading Information
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-5965
Member content until: Friday, February 08 2008

Comment: Redhat have confirmed that their products are not vulnerable.

OVERVIEW:

        A vulnerability has been reported in Trolltech QT where SSL 
        certificated are not properly verified.


IMPACT:

        Trolltech have released the following information regarding this
        vulnerability:

        "Qt 4 versions 4.3.0, 4.3.1 and 4.3.2 have a potential 
        vulnerability in QSslSocket, which might cause a certificate 
        verification in SSL connections not to be performed. As a 
        consequence, code using QSslSocket might be misled into thinking 
        the certificate was verified correctly when it actually failed in 
        one or more criteria." [1]


MITIGATION:

        A patch has been released to address this issue. It is available 
        for download from the Trolltech website. [2]


REFERENCES:

        [1] Trolltech releases security fix for Qt 4.3 
            http://trolltech.com/company/newsroom/announcements/press.2007-12-21.2182567220

        [2] Trolltech Qt 4.3 Patch
            http://dist.trolltech.com/developer/download/190133.patch

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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